MICA and pancreatic ductal adenocarcinoma: Vδ1 T cells express one of various Vγ chains (Vγ 2, 3, 4, 5, or 8) and recognize microbial- and self-lipids bound to CD1d molecules or stress-induced MHC class-I related chain A (MICA), that are frequently expressed on tumor cells including pancreatic ductal adenocarcinomas cells (PDAC) (36–38).